[Bug 782923] gl: Add Mesa3D GBM backend

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=782923

--- Comment #24 from Carlos Rafael Giani <dv at pseudoterminal.org> ---
Daniel: set_window_handle is part of the GstVideoOverlay functionality. This is
how you can embed a GStreamer video sink inside, say, a Gtk interface.
set_window_handle() is then called to supply the code with an existing window
handle. What this handle is, is platform specific. In X, it is a Window id.

Since I do not see why anybody would want to embed GBM buffer objects anywhere,
I added that comment. I wrote the GBM support with a single fullscreen video
output in mind, just like the Vivante FB support.

As for the rest, thanks for the info! I have one remaining question: do you see
anything wrong with how the BOs and the page flipping are done in draw_cb() ? I
think this is proper triple buffering. Do you?

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